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VIDEO IMAGES OF SMOKE DISPERSION IN THE NEAR WAKE OF A BUILDING PART I. TEMPORAL AND SPATIAL SCALES OF VORTEX SHEDDING
Citation:
Huber, A. VIDEO IMAGES OF SMOKE DISPERSION IN THE NEAR WAKE OF A BUILDING PART I. TEMPORAL AND SPATIAL SCALES OF VORTEX SHEDDING. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-88/332 (NTIS PB89206676).
Description:
In a wind-tunnel study, recorded video images of smoke dispersion in the wake of a rectangular-shaped building web analyzed. ontinuous source of smoke was emitted at floor level, midway along the leeward side of the building. moke was observed to build up within a region adjacent to the building. hen the smoke was periodically swept away by vortices shed from the leeward building sides and roof. The applicability of analyzing time series of smoke-scattered light for selected quantized video picture elements was favorably demonstrated. emporal and spatial scales of vortex-shedding of smoke puffs near the center of the wake were quantified through the calculation of spectral densities and autocorrelations. he dominant frequencies (cycles/second) near the center of the wake flow were found to be 0.1-0.3 times the ratio of the velocity to the building height. stimated integral length scales near the center of the wake flow were found to be 1-2 times the building height.